diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index d6072bca66..b278d522bb 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1770,7 +1770,7 @@ VALUE rb_check_symbol(volatile VALUE *namep);
     do RUBY_CONST_ID_CACHE((var) =, (str)) while (0)
 #define CONST_ID_CACHE(result, str) RUBY_CONST_ID_CACHE(result, str)
 #define CONST_ID(var, str) RUBY_CONST_ID(var, str)
-#ifdef __GNUC__
+#ifdef HAVE_BUILTIN___BUILTIN_CONSTANT_P
 /* __builtin_constant_p and statement expression is available
  * since gcc-2.7.2.3 at least. */
 #define rb_intern(str) \